CN216620349U - Biomass organic Rankine cycle combined cooling heating and power system - Google Patents

Abstract

The utility model provides a biomass organic Rankine cycle combined cooling heating and power system, which comprises: the system comprises a pressure-bearing hot water circulation loop, an organic Rankine circulation loop and a single-effect lithium bromide absorption refrigeration circulation loop, wherein the organic Rankine circulation loop and the single-effect lithium bromide absorption refrigeration circulation loop are sequentially connected in series in the pressure-bearing hot water circulation loop through pipelines; the pressure-bearing hot water circulation loop is used for providing a heat source for the organic Rankine cycle loop and the single-effect lithium bromide absorption refrigeration cycle loop by taking pressure-bearing hot water as a medium.

Description

Biomass organic Rankine cycle combined cooling heating and power system

Technical Field

The utility model relates to the technical field of renewable distributed energy, in particular to a biomass organic Rankine cycle combined cooling heating and power system.

Background

The biomass organic Rankine cycle combined heat and power system is a renewable distributed energy system, and supplies power, heating or domestic hot water to users by using carbon neutralization energy with strong dispersibility and low energy flux density.

The traditional biomass organic Rankine cycle combined heat and power system generally adopts a conduction oil cycle to provide power. The heat conduction oil as a working medium has high requirement on temperature, the maximum temperature of the heat conduction oil can reach 630K, and in order to reasonably match a heat source, the evaporation temperature of an organic working medium in an organic Rankine cycle is usually set to be 600K, and the condensation temperature is set to be 370K. Most organic working media have lower normal boiling points, critical temperatures and critical pressures, so that the selection range of the organic working media in the organic Rankine cycle is limited. In addition, the temperature matching of the heat conduction oil and the high-temperature heat source is generally poor, which results in low power generation efficiency and heat utilization rate of the system.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a combined cooling heating and power system of biomass organic rankine cycle and a method for providing a heat source, so as to at least partially solve the above technical problems.

According to one aspect of the utility model, a biomass organic Rankine cycle combined cooling heating and power system is provided, which comprises: the system comprises a pressure-bearing hot water circulation loop, an organic Rankine circulation loop and a single-effect lithium bromide absorption refrigeration circulation loop, wherein the organic Rankine circulation loop and the single-effect lithium bromide absorption refrigeration circulation loop are sequentially connected in series in the pressure-bearing hot water circulation loop through pipelines; the pressure-bearing hot water circulation loop is used for providing a heat source for the organic Rankine cycle loop and the single-effect lithium bromide absorption refrigeration cycle loop by taking pressure-bearing hot water as a medium.

Preferably, the pressurized hot water circulation circuit includes: the biomass boiler comprises a biomass boiler, a pressure-bearing hot water outlet pipe and a pressure-bearing hot water inlet pipe which are connected with the biomass boiler, wherein a first evaporator, a generator and a pressure-bearing hot water pump are sequentially connected in series between the pressure-bearing hot water outlet pipe and the pressure-bearing hot water inlet pipe through pipelines; the organic Rankine cycle loop and the single-effect lithium bromide absorption refrigeration cycle loop are respectively connected in series in the pressure-bearing hot water cycle loop through the first evaporator and the generator; the biomass boiler is used for combusting biomass fuel and air to heat feed water returned to the biomass boiler through the generator to obtain pressure-bearing hot water, the pressure-bearing hot water exchanges heat with an organic working medium in the organic Rankine cycle loop in the first evaporator to provide a heat source for the organic Rankine cycle loop, and the pressure-bearing hot water after heat exchange provides the heat source for the single-effect lithium bromide absorption refrigeration cycle loop through the generator.

Preferably, the organic rankine cycle circuit includes: the first evaporator, the expander that connects gradually series connection through pipeline and first evaporator, first condenser and working medium pump, wherein, the organic working medium input of first evaporator is connected to the organic working medium output of working medium pump, the pressure-bearing hot water outlet pipe is connected to the first hot water outlet pipe of the input of the first hot exchange pipe that is used for carrying out the heat exchange with organic working medium in the first evaporator, the generator is connected to the output of first hot exchange pipe, the input of the first heat exchange water pipe that is used for carrying out the heat exchange with organic working medium in the first condenser passes through the water supply pipe and connects the water supply end, the output of first heat exchange water pipe loops through first cooling water pump and cooling tower and is connected with the input of first heat exchange water pipe, the power consumption equipment is connected to the power take off end of expander.

Preferably, a first three-way valve is further arranged on a pipeline between the output end of the first heat exchange water pipe and the first cooling water pump, the input end of the first three-way valve is connected with the output end of the first heat exchange water pipe, the first output end of the first three-way valve is connected with the first cooling water pump, and the second output end of the first three-way valve is connected with the first heating water supply pipe through a domestic hot water pump; when a first preset condition is met, switching the first three-way valve to enable the second output end of the first three-way valve to be communicated with the first heating water supply pipe, and disconnecting the first output end of the first three-way valve from being communicated with the first cooling water pump; when the first preset condition is not met, the first output end of the first three-way valve is communicated with the first cooling water pump by switching the first three-way valve, and the second output end of the first three-way valve is disconnected from the first heating water supply pipe.

Preferably, the single-effect lithium bromide absorption refrigeration cycle comprises: the generator, a second condenser, a second evaporator, an absorber, a solution pump and a lithium bromide solution heat exchanger which are sequentially connected in series with the generator through pipelines, wherein the input end of a second heat exchange tube used for exchanging heat with a lithium bromide solution in the generator is connected with the output end of the first heat exchange tube, and the output end of the second heat exchange tube is connected with a pressure-bearing hot water pump; the dilute solution input of generator is connected with the dilute solution output of lithium bromide solution heat exchanger, the dilute solution input of lithium bromide solution heat exchanger is connected with the dilute solution output of absorber through the solution pump, the concentrated solution output of generator is connected with the concentrated solution input of lithium bromide solution heat exchanger, the concentrated solution output of lithium bromide solution heat exchanger is connected with the concentrated solution input of absorber through the second choke valve, the output of generator is connected with the input of second condenser, the output of second condenser is connected with the input of second evaporimeter through first choke valve, the output of second evaporimeter is connected with the input of absorber.

Preferably, the single-effect lithium bromide absorption refrigeration cycle loop further comprises a refrigerant water circulation sub-loop, wherein the refrigerant water circulation sub-loop comprises a second evaporator, a refrigerant water pump, a second three-way valve, a cold supply water pipe and a cold supply water return pipe, wherein a refrigerant water output end of the second evaporator is connected with an input end of the second three-way valve through the refrigerant water pump, a first output end of the second three-way valve is connected with an input end of the first heat exchange water pipe, a second output end of the second three-way valve is connected with the cold supply water pipe, and a water replenishing end of the second evaporator is connected with the cold supply water return pipe and is connected with a water supply end through the water supply pipe; when a second preset condition is met, switching a second three-way valve to enable a second output end of the second three-way valve to be communicated with a cold supply water supply pipe, and disconnecting a first output end of the second three-way valve from being communicated with an input end of the first heat exchange water pipe; when the second preset condition is not met, the first output end of the second three-way valve is communicated with the input end of the first heat exchange water pipe by switching the second three-way valve, and the second output end of the second three-way valve is disconnected from the cold supply water pipe.

Preferably, the system further comprises: and the flue gas MEA (ethanolamine) carbon capture circulation loop is connected with the biomass boiler and used for processing the first flue gas generated after the biomass fuel and the air are combusted so as to capture the carbon dioxide in the first flue gas.

Preferably, the flue gas MEA carbon capture circulation loop comprises an air preheater, a flue gas purification device, an absorption tower, an MEA solution heat exchanger, a desorption tower, a cooler, a rich liquid pump, a barren liquid pump and a reboiler, wherein, air heater's flue gas inlet and biomass boiler's exhanst gas outlet connection, air heater's hot-air outlet and biomass boiler's air inlet connection, air heater's exhanst gas outlet and smoke purification device's exhanst gas inlet connection, smoke purification device's exhanst gas outlet is connected with the air inlet of absorption tower, the gas outlet of absorption tower accesss to the atmosphere, the inlet of absorption tower loops through MEA solution heat exchanger, barren liquor pump and reboiler are connected with the liquid outlet of analytic tower, the liquid outlet of absorption tower loops through the rich liquid pump, MEA solution heat exchanger is connected with the inlet of analytic tower, the gas outlet of analytic tower passes through the cooler and is connected with the carbon dioxide storage tank.

Preferably, the single-effect lithium bromide absorption refrigeration cycle further comprises a cooling water circulation sub-loop, and the cooling water circulation sub-loop is connected with the reboiler through a pipeline and used for recovering heat exchanged between the absorber and the second condenser and providing heat for the desorption tower through the reboiler.

Preferably, the cooling water circulation sub-loop comprises an absorber, a second cooling water pump and a second condenser, wherein the input end of a third heat exchange water pipe used for carrying out heat exchange with the lithium bromide solution in the absorber is connected with the water supply end through a water supply pipe, the output end of the third heat exchange water pipe is connected with the input end of a second heat exchange water pipe in the second condenser through the second cooling water pump, and the second heat exchange water pipe is used for carrying out heat exchange with refrigerant steam generated by the generator; the flue gas MEA carbon capture circulation loop further comprises a steam generator which is arranged between a flue gas inlet of the air preheater and a flue gas outlet of the biomass boiler, and a water inlet and a water outlet of the steam generator are respectively connected with an output end of the second heat exchange water pipe and the reboiler.

Preferably, the system further comprises a heat exchange station, and the heat exchange station is respectively connected with the reboiler, the second heating water supply pipe and the heating water return pipe.

Preferably, the heat exchange station is also connected with the input end of a third heat exchange water pipe in the absorber through a second cooling tower.

Preferably, the system further comprises a third heating water supply pipe, an input end of the third heating water supply pipe is connected between the heat exchange station and the second cooling tower through a valve, and an output end of the third heating water supply pipe is connected between a second output end of the first three-way valve and the domestic hot water pump.

Preferably, a first temperature sensor is further arranged on a pipeline between the output end of the first heat exchange water pipe and the first three-way valve, and is used for detecting the temperature of the water output by the first heat exchange water pipe.

Preferably, the organic working fluid comprises at least one of halogenated hydrocarbons, alkanes and aromatic hydrocarbons.

Preferably, the power consumer comprises an electric generator, a working fluid pump or a water pump.

According to another aspect of the present invention, there is provided a method of providing a heat source, the method including: producing pressure-bearing hot water by using a pressure-bearing hot water circulation loop; the heat source is provided for the organic Rankine cycle loop and the single-effect lithium bromide absorption refrigeration cycle loop by taking the pressure-bearing hot water as a medium, so that the organic Rankine cycle loop is driven to generate power, and the single-effect lithium bromide absorption refrigeration cycle loop is driven to refrigerate.

The technical scheme of the utility model at least has the following advantages:

(1) the utility model adopts the pressure-bearing hot water circulation loop to sequentially connect the organic Rankine cycle loop and the single-effect lithium bromide absorption refrigeration cycle loop in series, and provides heat source for the organic Rankine cycle loop and the single-effect lithium bromide absorption refrigeration cycle loop by taking the pressure-bearing hot water as a medium, thereby not only realizing flexible output of electricity, heat and cold, but also expanding the selection range of the organic working medium, being beneficial to efficient matching heat exchange of the heat source and the organic working medium in an evaporator, and further improving the power generation efficiency and the heat efficiency of the system.

(2) The single-effect lithium bromide absorption refrigeration cycle loop and the organic Rankine cycle loop are connected through the refrigerant water circulation sub-loop, the refrigerant water generated in the single-effect lithium bromide absorption refrigeration cycle loop is utilized to reduce the condensation temperature of the organic Rankine cycle, the condensation effect of the organic Rankine cycle is improved, and therefore the power generation efficiency and the heat efficiency of the system are improved.

(3) The utility model couples the MEA carbon capture loop of the chemical absorption method, captures the carbon dioxide in the biomass flue gas, realizes the carbon negative emission of a biomass energy system, provides heat for the flue gas MEA carbon capture system by recovering the heat exchange and the flue gas waste heat in the single-effect lithium bromide absorption refrigeration cycle, realizes the cascade utilization of the recovered cooling heat and the flue gas preheating, reduces the irreversible heat loss in the system, and obviously improves the thermal efficiency of the system.

(4) The utility model further utilizes the heat exchange station to convert the heat in the exhaust steam generated by the flue gas MEA carbon capture loop so as to supply heat for users or domestic hot water, thereby obviously improving the heat efficiency of the system. In addition, water generated after the dead steam is condensed can be recycled for single-effect lithium bromide absorption refrigeration circulation, so that closed loops of the single-effect lithium bromide absorption refrigeration circulation and a flue gas MEA carbon capture loop are formed, and the system efficiency and the resource utilization rate are improved.

Drawings

FIG. 1 shows a schematic structural diagram of a biomass organic Rankine cycle combined cooling heating and power system according to an embodiment of the utility model;

FIG. 2 shows a schematic structure diagram of a biomass organic Rankine cycle combined cooling heating and power system according to another embodiment of the utility model;

FIG. 3 shows a schematic structural diagram of a biomass organic Rankine cycle combined cooling heating and power system according to another embodiment of the utility model;

FIG. 4 shows a flow chart of a method of providing a heat source according to an embodiment of the utility model.

Description of reference numerals:

A. air; B. a biomass fuel; C. pressure-bearing hot water; D. a first flue gas; E. cooling water; F. second flue gas; G. carbon dioxide; H. exhaust steam; J. cleaning the flue gas; 10. a biomass boiler; 11. a pressure-bearing hot water outlet pipe; 12. a pressure-bearing hot water inlet pipe; 13. a pressure-bearing hot water pump; 20. a first evaporator; 21. an expander; 22. a first condenser; 23. a working medium pump; 24. a power consuming device; 221. a first three-way valve; 222. a first cooling water pump; 223. a first cooling tower; 224. a first temperature sensor; 30. a generator; 31. a lithium bromide solution heat exchanger; 32. a solution pump; 33. an absorber; 34. a second throttle valve; 35. a second evaporator; 36. a first throttle valve; 37. a second condenser; 38. a second cooling pump; 351. a refrigerant water pump; 352. a cold supply water pipe; 353. a cold supply water return pipe; 354. a second three-way valve; 355. a second cooling tower; 356. a valve; 40. a user; 41. a domestic hot water pump; 411. a first heating water supply pipe; 412. a third heating water supply pipe; 50. a power grid; 61. an air preheater; 62. a flue gas purification device; 63. an absorption tower; 64. an MEA solution heat exchanger; 65. a rich liquor pump; 66. a barren liquor pump; 67. an analytical tower; 68. a reboiler; 69. a cooler; 610. a steam generator; 611. a first return pipe; 612. a second return pipe; 613. a carbon dioxide storage tank; 70. a heat exchange station; 701. a second heating water supply pipe; 702. and a second heating water return pipe.

Detailed Description

In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.

It should be noted that fig. 1 to 4 are only preferred examples of the present invention to help those skilled in the art understand the technical contents of the present invention, but the implementation of the present invention is not meant to be limited thereto. In the drawings or description, like or similar parts are designated with the same reference numerals. Implementations not depicted or described in the drawings are of a form known to those of ordinary skill in the art. Additionally, while exemplifications of parameters including particular values may be provided herein, it is to be understood that the parameters need not be exactly equal to the respective values, but may be approximated to the respective values within acceptable error margins or design constraints. In addition, directional terms, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like, referred to in the following embodiments are only directions referring to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The traditional biomass organic Rankine cycle combined heat and power system generally adopts a conduction oil cycle to provide power. The requirement of heat conduction oil as a working medium on temperature is high, the highest temperature of the heat conduction oil can reach 630K, and in order to reasonably match a heat source, the evaporation temperature of the organic working medium in the organic Rankine cycle is usually set to be 600K, and the condensation temperature is set to be 370K. Because most organic working media have lower normal boiling points, critical temperatures and critical pressures, the organic working media can only be selected from high-temperature working media matched with the temperature of heat conduction oil, so that the selection range of the organic working media in the organic Rankine cycle is limited. For example, in a biomass organic rankine cycle combined heat and power system in the related art, a siloxane high-temperature working medium such as octamethyltrisiloxane is used as an organic working medium, but the substance has strong flammability, so that the danger of burning and explosion of the working medium exists. Based on the considerations of applicability, safety and the like, the selection range of the organic working medium matched with the heat conduction oil is further limited. In addition, the temperature matching between the heat conduction oil and the high-temperature heat source is poor, so that the power generation efficiency and the heat utilization rate of the system are low. In view of the above, the present invention provides a combined cooling, heating and power system of biomass organic rankine cycle and a method for providing a heat source, so as to at least partially solve the above technical problems.

One aspect of the present invention provides a biomass organic rankine cycle combined cooling heating and power system, including: the system comprises a pressure-bearing hot water circulation loop, an organic Rankine circulation loop and a single-effect lithium bromide absorption refrigeration circulation loop, wherein the organic Rankine circulation loop and the single-effect lithium bromide absorption refrigeration circulation loop are sequentially connected in series in the pressure-bearing hot water circulation loop through pipelines. The pressure-bearing hot water circulation loop is used for providing a heat source for the organic Rankine cycle loop and the single-effect lithium bromide absorption refrigeration cycle loop by taking pressure-bearing hot water as a medium.

Here, the pressurized hot water refers to hot water with a certain temperature and/or pressure produced by a pressurized hot water circulation loop. In embodiments of the present invention, pressurized hot water produced by the pressurized hot water circulation loop can provide heat requirements below 180 ℃, for example, for an organic rankine cycle loop and a single-effect lithium bromide absorption refrigeration cycle loop.

Compared with a mode of providing power by adopting heat conduction oil as a working medium, the embodiment of the utility model adopts the pressure-bearing hot water as the heating working medium to provide a heat source for the organic Rankine cycle loop and the single-effect lithium bromide absorption refrigeration cycle loop, thereby not only avoiding the safety problem caused by adopting the heat conduction oil for heating, but also matching the temperature of the pressure-bearing hot water (for example, below 180 ℃) with most of the organic working medium, expanding the selection range of the organic working medium, and being beneficial to realizing efficient matching heat exchange between the heat source and the organic working medium by taking the pressure-bearing hot water as the working medium, thereby improving the power generation efficiency and the heat efficiency of the system.

In the embodiment of the present invention, the organic rankine cycle may generate power or heat using heat supplied from pressurized hot water, for example, and the single-effect lithium bromide absorption refrigeration cycle may cool using heat supplied from pressurized hot water, thereby flexibly supplying power, heating, cooling, and domestic water to users.

According to the technical scheme, the pressure-bearing hot water circulation loop is sequentially connected with the organic Rankine cycle loop and the single-effect lithium bromide absorption type refrigeration cycle loop in series, and the pressure-bearing hot water is used as a medium to provide a heat source for the organic Rankine cycle loop and the single-effect lithium bromide absorption type refrigeration cycle loop, so that flexible output of electricity, heat and cold can be realized. In addition, because the utility model adopts the pressure-bearing hot water as the working medium, thereby expanding the selection range of the organic working medium, being beneficial to realizing high-efficiency matching heat exchange between the heat source and the organic working medium, and further improving the power generation efficiency and the heat efficiency of the system.

An exemplary implementation of the biomass organic rankine cycle combined cooling heating and power system according to the embodiment of the utility model will be described in detail with reference to fig. 1 to 3. It should be noted that the structure of the combined cooling, heating and power system of the biomass organic rankine cycle shown in fig. 1 to 3 is only exemplary to help those skilled in the art understand the scheme of the present invention, and is not intended to limit the protection scope of the present invention.

Fig. 1 shows a schematic structural diagram of a biomass organic rankine cycle combined cooling heating and power system according to an embodiment of the utility model.

As shown in FIG. 1, the biomass organic Rankine cycle combined cooling heating and power system comprises a pressure-bearing hot water circulation loop, an organic Rankine cycle loop and a single-effect lithium bromide absorption refrigeration circulation loop.

In an embodiment of the utility model, a pressurized hot water circulation loop comprises: the biomass boiler comprises a biomass boiler 10, and a pressure-bearing hot water outlet pipe 11 and a pressure-bearing hot water inlet pipe 12 which are connected with the biomass boiler 10, wherein a first evaporator 20, a generator 30 and a pressure-bearing hot water pump 13 are sequentially connected in series between the pressure-bearing hot water outlet pipe 11 and the pressure-bearing hot water inlet pipe 12 through pipelines. The organic Rankine cycle loop and the single-effect lithium bromide absorption refrigeration cycle loop are respectively connected in series in the pressure-bearing hot water cycle loop through the first evaporator 20 and the generator 30.

In the embodiment of the utility model, the biomass boiler 10 is used for combusting the biomass fuel B and the air A to heat the feed water returned to the biomass boiler 10 through the generator 30 to obtain the pressure-bearing hot water C, the pressure-bearing hot water C exchanges heat with the organic working medium in the organic Rankine cycle loop in the first evaporator 20 to provide a heat source for the organic Rankine cycle loop, and the pressure-bearing hot water after heat exchange provides the heat source for the single-effect lithium bromide absorption refrigeration cycle loop through the generator 30.

In an embodiment of the present invention, the organic rankine cycle includes: the system comprises a first evaporator 20, an expander 21, a first condenser 22 and a working medium pump 23 which are sequentially connected with the first evaporator 20 in series through pipelines.

An organic working medium output end of the working medium pump 23 is connected with an organic working medium input end of the first evaporator 20, an input end of a first heat exchange pipe (not shown in the figure) used for carrying out heat exchange with the organic working medium in the first evaporator 20 is connected with the pressure-bearing hot water outlet pipe 11, an output end of the first heat exchange pipe is connected with the generator 30, and an input end of a first heat exchange water pipe (not shown in the figure) used for carrying out heat exchange with the organic working medium in the first condenser 22 is connected with a water supply end through a water supply pipe so as to introduce cooling water E. The output end of the first heat exchange water pipe is connected with the input end of the first heat exchange water pipe through a first cooling water pump 222 and a first cooling tower 223 in sequence, and the power output end of the expansion machine 21 is connected with the power consumption device 24.

In the embodiment of the utility model, pressure-bearing hot water C generated by burning biomass fuel B and air a by a biomass boiler 10 is conveyed into a first evaporator 20 through a pressure-bearing hot water outlet pipe 11, exchanges heat with organic working media in the first evaporator 20, and the evaporated organic working media enter an expansion machine 21 to expand and do work and drive a power consumption device 24. The expanded organic working medium is condensed by the first condenser 22, then returns to the first evaporator 20 by the working medium pump 23 to absorb heat, and the steps are repeated in a circulating manner.

In the embodiment of the present invention, the condensation heat in the first condenser 22 is released through a cooling circuit, and here, the so-called cooling circuit may include, for example, a water supply pipe, the first condenser 22, the first three-way valve 221, the first cooling water pump 222, and the first cooling tower 223 connected in series in this order.

Specifically, the high-temperature condensed water output by the first condenser 22 is sent to the first cooling tower 223 through the first cooling water pump 222, and after the first cooling tower 223 releases the condensed heat to the environment, the low-temperature cooling water is sent to the first condenser 22, so that the recycling of the cooling water E is realized.

In the embodiment of the present invention, the system uses the waste heat of the pressurized hot water to drive the expansion machine 21 to expand and do work, so as to drive the power consumption device 24. In some embodiments, the power consumption device 24 may be, for example, an electric generator, a working fluid pump, or a water pump, among others. For example, when the power consumption device 24 is a generator, the system can utilize the residual heat of the pressurized hot water to drive the expansion machine 21 to perform expansion work to generate power, and output the power to the user 40 or be incorporated into the power grid 50. It should be noted that the contents of the drawings and the description of the present invention, which take the power consumption device 24 as an example of a generator, are only for facilitating the understanding of the solution of the present invention by those skilled in the art, and are not intended to limit the protection scope of the present invention.

As described above, the conventional biomass organic rankine cycle cogeneration system generally uses a conduction oil cycle to provide power, and due to the aspects of applicability, safety and the like, the adoption of the conduction oil as a working medium not only limits the selection range of organic working media in the organic rankine cycle, but also causes lower system power generation efficiency and lower heat utilization rate due to poor temperature matching between the conduction oil and a high-temperature heat source.

Compared with a biomass organic Rankine cycle combined cooling heating and power system adopting heat conduction oil circulation to provide power, the embodiment of the utility model adopts the pressure-bearing hot water as the working medium, can provide the heat source requirement below 180 ℃, and can be matched with most organic working media, thereby expanding the selection range of the organic working media, and the pressure-bearing hot water is used as the working medium, which is beneficial to the efficient matching heat exchange between the heat source and the organic working media in an evaporator, thereby improving the power generation efficiency and the heat efficiency of the system. In addition, the organic Rankine cycle is used as power cycle, the pressure-bearing hot water circulation loop is used as a heat source, and the requirements of miniaturization and distributed application of the biomass direct-fired power generation system can be met.

In an embodiment of the present invention, the organic working fluid circulating in the organic rankine cycle may include at least one of halogenated hydrocarbon, alkane, and aromatic hydrocarbon, for example.

It should be noted that the organic working fluid referred to herein may include at least one of halogenated hydrocarbon, alkane and aromatic hydrocarbon, and specifically may include two layers: in one aspect, at least one of the above-mentioned groups may be selected as the organic working medium, for example, a chlorinated hydrocarbon, a brominated hydrocarbon, a fluorinated hydrocarbon or other halogenated hydrocarbon in the halogenated hydrocarbons, or a mixture of any two or more of the above-mentioned halogenated hydrocarbons may be selected as the organic working medium. Secondly, at least one of the above two substances can be selected as the organic working medium, for example, a mixture of at least one of the alkanes and at least one of the halogenated hydrocarbons can be selected as the organic working medium. In the embodiment of the utility model, the mixed working medium (comprising the working medium obtained by mixing different substances of the same type and the working medium obtained by mixing different substances of different types) has the temperature slip characteristic, and the heat exchange matching property can be increased, so that the power generation efficiency and the heat efficiency of the system are improved.

In addition, the above description of the organic working fluid is only exemplary to help those skilled in the art understand the scheme of the present invention, and is not intended to limit the protection scope of the present invention.

In the embodiment of the present invention, a first three-way valve 221 is further disposed on a pipeline between the output end of the first heat-exchange water pipe and the first cooling water pump 222, an input end of the first three-way valve 221 is connected to the output end of the first heat-exchange water pipe, a first output end of the first three-way valve 221 is connected to the first cooling water pump 222, and a second output end of the first three-way valve 221 is connected to the first heating water supply pipe 411 through the domestic hot water pump 41.

In the embodiment of the present invention, the orc circuit may be controlled to heat or supply hot water to the user 40 by switching the first three-way valve 221 according to actual needs. For example, when the first preset condition is satisfied, by switching the first three-way valve 221 such that the second output terminal of the first three-way valve 221 is communicated with the first heating water supply pipe 411 and the first output terminal of the first three-way valve 221 is disconnected from the first cooling water pump 222; when the first preset condition is not satisfied, the first output terminal of the first three-way valve 221 is communicated with the first cooling water pump 222 by switching the first three-way valve 221, and the second output terminal of the first three-way valve 221 is disconnected from the first heating water supply pipe 411.

In an embodiment of the utility model, the first preset condition may be, for example, that the temperature of the water output from the first heat exchange water pipe satisfies a preset threshold, where the preset threshold may be a preset value or a preset range, and is not limited herein. When the preset condition is satisfied, the first heating water supply pipe 411 may be connected by switching the first three-way valve 221, thereby heating or supplying hot water to the user 40. If the preset condition is not satisfied, it means that the temperature of the heat of condensation in the first condenser 22 recovered at this time is low and is not suitable for supplying to the user 40 as domestic hot water (for example only), at this time, the cooling circuit of the first condenser 22 (for example, a water supply pipe, the first condenser 22, the first three-way valve 221, the first cooling water pump 222, and the first cooling tower 223 which are connected in series in this order may be connected by switching the first three-way valve 221, and after the heat of condensation is released to the environment by the first cooling tower 223, the cooling water E is sent to the first condenser 22, thereby realizing the recycling of the cooling water E.

In some embodiments of the present invention, a first temperature sensor (not shown in fig. 1) is further disposed on a pipeline between the output end of the first heat-exchange water pipe and the first three-way valve 221, and is configured to detect a temperature of water output by the first heat-exchange water pipe, so that the switching output of the first three-way valve 221 can be accurately controlled according to the temperature.

In an embodiment of the present invention, the single-effect lithium bromide absorption refrigeration cycle includes: the generator 30, a second condenser 37, a second evaporator 35, an absorber 33, a solution pump 32 and a lithium bromide solution heat exchanger 31 which are connected in series with the generator 30 in sequence through pipelines.

The input end of a second heat exchange tube (not shown in the figure) used for exchanging heat with the lithium bromide solution in the generator 30 is connected with the output end of the first heat exchange tube in the first evaporator 20, and the output end of the second heat exchange tube is connected with the pressure-bearing hot water pump 13, so that the pressure-bearing hot water after heat exchange of the first evaporator 20 can be sent into the generator 30 to exchange heat with the lithium bromide solution, and then the water source after heat exchange is returned to the biomass boiler 10 through the pressure-bearing hot water pump 13 to be heated, so that the loop circulation of the pressure-bearing hot water C is completed.

In the embodiment of the present invention, a dilute solution input end of the generator 30 is connected to a dilute solution output end of the lithium bromide solution heat exchanger 31, a dilute solution input end of the lithium bromide solution heat exchanger 31 is connected to a dilute solution output end of the absorber 33 through the solution pump 32, a concentrated solution output end of the generator 30 is connected to a concentrated solution input end of the lithium bromide solution heat exchanger 31, a concentrated solution output end of the lithium bromide solution heat exchanger 31 is connected to a concentrated solution input end of the absorber 33 through the second throttle valve 34, an output end of the generator 30 is connected to an input end of the second condenser 37, an output end of the second condenser 37 is connected to an input end of the second evaporator 35 through the first throttle valve 36, and an output end of the second evaporator 35 is connected to an input end of the absorber 33.

In an embodiment of the present invention, the single-effect lithium bromide absorption refrigeration cycle further includes a refrigerant water circulation sub-loop. The refrigerant water circulation sub-circuit includes a second evaporator 35, a refrigerant water pump 351, a cooling water supply pipe 352, and a cooling water return pipe 353. The refrigerant water output end of the second evaporator 35 is communicated with the cooling water supply pipe 352 through the refrigerant water pump 351, the water replenishing end of the second evaporator 35 is connected with the cooling water return pipe 353, and the cooling water supply pipe 352 and the cooling water return pipe 353 are connected to the user 40 through the change-over valve respectively. Based on the structure, the single-effect lithium bromide absorption refrigeration circulation loop can be used for refrigerating so as to supply cold for the user 40.

Fig. 2 shows a schematic structural diagram of a biomass organic rankine cycle combined cooling heating and power system according to another embodiment of the utility model.

As shown in fig. 2, compared to the biomass organic rankine cycle combined cooling heating and power system shown in fig. 1, the biomass organic rankine cycle combined cooling, heating and power system in the present embodiment provides another single-effect lithium bromide absorption refrigeration cycle refrigerant water circulation sub-loop.

As shown in fig. 2, in the embodiment of the present invention, the refrigerant water circulation sub-circuit includes a second evaporator 35, a refrigerant water pump 351, a second three-way valve 354, a cooling water supply pipe 352, and a cooling water return pipe 353.

A refrigerant water output end of the second evaporator 35 is connected with an input end of a second three-way valve 354 through a refrigerant water pump 351, a first output end of the second three-way valve 354 is connected with an input end of a first heat exchange water pipe in the first condenser 22, a second output end of the second three-way valve 354 is connected with a cooling water supply pipe 352, and a water supplementing end of the second evaporator 35 is connected with a cooling water return pipe 353 and is connected with a water supply end through a water supply pipe.

In the embodiment of the present invention, the second three-way valve 354 is switched to control the single-effect lithium bromide absorption refrigeration cycle to supply cold to the user 40 according to actual needs. For example, when the second preset condition is satisfied, by switching the second three-way valve 354 such that the second output terminal of the second three-way valve 354 is communicated with the cooling water supply pipe 352 and the first output terminal of the second three-way valve 354 is disconnected from the input terminal of the first heat exchange water pipe; when the second preset condition is not satisfied, the first output terminal of the second three-way valve 354 is communicated with the input terminal of the first heat exchange water pipe by switching the second three-way valve 354, and the second output terminal of the second three-way valve 354 is disconnected from the cooling water supply pipe 352.

In the embodiment of the present invention, the second preset condition may be set according to the external environment temperature, for example, the second preset condition may be that when the external environment temperature is high (for example, in summer), the refrigerant water generated by the second evaporator 35 may be used to supply cold to the user 40, and when the external environment temperature is low (for example, in winter, spring and autumn), the supply of cold to the user 40 may be stopped, and at this time, the refrigerant water generated by the second evaporator 35 may be switched to the input end of the first heat exchange water pipe through the second three-way valve 354 to cool the first condenser 22, so as to reduce the condensation temperature of the organic rankine cycle, improve the condensation effect of the organic rankine cycle, and thus improve the power generation efficiency and the heat efficiency of the system.

In some embodiments of the present invention, in order to more accurately determine the temperature of the external environment, for example, a second temperature sensor (not shown) may be disposed on an outer wall of a pipe between the second three-way valve 354 and the refrigerant water pump 351 to detect the temperature of the external environment, so as to accurately control the switching of the second three-way valve 354.

In the embodiment of the utility model, the biomass organic rankine cycle combined cooling heating and power system further includes a flue gas MEA carbon capture circulation loop, which is connected to the biomass boiler 10, and is used for processing the first flue gas D generated after the combustion of the biomass fuel B and the air a, so as to capture carbon dioxide in the first flue gas D.

As shown in fig. 2, the flue gas MEA carbon capture circulation loop includes an air preheater 61, a flue gas purification device 62, an absorption tower 63, an MEA solution heat exchanger 64, a rich solution pump 65, a lean solution pump 66, a desorption tower 67, a reboiler 68, and a cooler 69.

Flue gas inlet of air heater 61 is connected with biomass boiler 10's exhanst gas outlet, air heater 61's hot-air outlet is connected with biomass boiler 10's air inlet, air heater 61's exhanst gas outlet is connected with flue gas purification device 62's exhanst gas inlet, flue gas purification device 62's exhanst gas outlet is connected with the air inlet of absorption tower 63, the gas outlet of absorption tower 63 leads to the atmosphere, the inlet of absorption tower 63 loops through MEA solution heat exchanger 64, barren liquor pump 66 and reboiler 68 are connected with the liquid outlet of analytic tower 67, the liquid outlet of absorption tower 63 loops through rich liquor pump 65, MEA solution heat exchanger 64 is connected with the inlet of analytic tower 67, the gas outlet of analytic tower 67 passes through cooler 69 and is connected with carbon dioxide storage tank 613.

In the embodiment of the utility model, the air preheater 61 is used for preheating the air a by using the waste heat of the first flue gas D generated by the combustion of the biomass boiler 10, and sending the preheated air into the biomass boiler 10 to participate in the combustion reaction.

In the embodiment of the present invention, the flue gas cleaning device 62 is used for removing dust and filtering (e.g. filtering out NOx in the flue gas) from the first flue gas D fed by the air preheater 61, so as to obtain cleaner second flue gas F, the second flue gas F enters the absorption tower 63 to perform chemical reaction with the MEA solution, the clean flue gas J after carbon capture is discharged from the absorption tower 63, the MEA concentrated solution after carbon dioxide capture enters the desorption tower 67 through the rich solution pump 65 and the MEA solution heat exchanger 64, the high concentration carbon dioxide G desorbed in the desorption tower 67 is cooled by the cooler 69, discharged and collected, and the lean solution from which the carbon dioxide G is desorbed is subjected to heat exchange by the reboiler 68, the lean solution pump 66 and the MEA solution heat exchanger 64, and then enters the absorption tower 63, thereby realizing the cyclic capture of carbon dioxide in the first flue gas D and realizing the negative carbon emission of the biomass energy system.

In some embodiments of the present invention, the above-mentioned flue gas MEA carbon capture recycle loop further comprises a carbon dioxide storage tank 613, a first return pipe 611 and a second return pipe 612. The carbon dioxide storage tank 613 is provided between the cooler 69 and the carbon dioxide discharge line, and temporarily stores the recovered high-concentration carbon dioxide G. The first reflux pipe 611 is used to connect the carbon dioxide storage tank 613 and the desorption tower 67, and is used to return the coarsely collected high-concentration carbon dioxide to the desorption tower 67 for fine desorption, so as to obtain purer high-concentration carbon dioxide. The second return pipe 612 is used for connecting the reboiler 68 and the desorption tower 67, and is used for returning the barren solution separated out by the desorption tower 67 to the desorption tower 67 through the reboiler 68, so as to realize complete carbon dioxide desorption.

In the embodiment of the present invention, the single-effect lithium bromide absorption refrigeration cycle further comprises a cooling water circulation sub-loop, which is connected to the reboiler 68 through a pipeline, and is used for recovering the heat exchanged between the absorber 33 and the second condenser 37, and providing heat for the desorption tower 67 through the reboiler 68.

Specifically, the cooling water circulation sub-circuit includes an absorber 33, a second cooling water pump 38, and a second condenser 37, wherein an input end of a third heat exchange water pipe (not shown) for heat exchange with the lithium bromide solution in the absorber 33 is connected to a water supply end through a water supply pipe, and an output end of the third heat exchange water pipe is connected to an input end of a second heat exchange water pipe for heat exchange with the refrigerant vapor generated by the generator 30 in the second condenser 37 through the second cooling water pump 38.

In the embodiment of the utility model, the heat recovered by the cooling water circulation sub-loop is used for providing heat for the desorption tower, so that the system can realize self-heat supply in the process of capturing carbon dioxide in flue gas, the irreversible heat loss of the system is reduced, and the heat utilization efficiency of the system is improved.

In some embodiments of the present invention, the flue gas MEA carbon capture circulation loop further includes a steam generator 610 disposed between the flue gas inlet of the air preheater 61 and the flue gas outlet of the biomass boiler 10, and a water inlet and a water outlet of the steam generator 610 are respectively connected to the output end of the second heat exchange water pipe and the reboiler 68.

In this embodiment, the steam generator 610 is configured to further heat the heat exchanged in the recovered single-effect lithium bromide absorption refrigeration cycle by using the waste heat of the first flue gas D, so that the heated heat can further satisfy the heat consumption requirement of the flue gas MEA carbon capture system, thereby further reducing the irreversible heat loss of the system and significantly improving the heat utilization efficiency of the system.

In the embodiment of the utility model, the heat exchange and the flue gas waste heat in the recovered single-effect lithium bromide absorption refrigeration cycle are utilized to provide heat for the flue gas MEA carbon capture system, so that the cascade utilization of the recovered cooling heat and the flue gas preheating is further realized, the irreversible heat loss in the system is reduced, and the heat efficiency of the system is obviously improved.

Fig. 3 shows a schematic structural diagram of a biomass organic rankine cycle combined cooling heating and power system according to another embodiment of the utility model.

As shown in fig. 3, compared to the biomass organic rankine cycle combined cooling heating and power system shown in fig. 2, the biomass organic rankine cycle combined cooling, heating and power system in the present embodiment further includes a heat exchange station 70, and the heat exchange station 70 is connected to the reboiler 68, the second heating water supply pipe 701, and the second heating water return pipe 702, respectively.

The utility model further utilizes the heat exchange station 70 to convert the heat in the exhaust steam H generated by the flue gas MEA carbon capture system to supply heat for users or supply domestic hot water, thereby realizing the cascade utilization of the energy in the recovered exhaust steam, reducing the irreversible heat loss in the system and obviously improving the heat efficiency of the system.

In some embodiments, the heat exchange station 70 is also connected to the input of a third heat exchange water line in the absorber 33 through a second cooling tower 355. In some embodiments, the system further includes a third heating water supply pipe 412, an input end of the third heating water supply pipe 412 is connected between the heat exchange station 70 and the second cooling tower 355 through a valve, and an output end of the third heating water supply pipe 412 is connected between a second output end of the first three-way valve 221 and the domestic hot water pump 41.

In the present embodiment, the spent steam H from the reboiler 68 is condensed by the heat exchange station 70 to produce liquid water. If the temperature of the condensed water is high (for example, meets the temperature standard of the domestic user), the condensed water can be supplied to the user 40 as domestic hot water through the third heating water supply pipe 412 and the valve 356; if the temperature of the condensed water is low, the condensed water can be conveyed to the absorber 33 at the moment to be recycled in the single-effect lithium bromide absorption refrigeration cycle, and then the exchange heat in the single-effect lithium bromide absorption refrigeration cycle loop is recycled to provide heat for the flue gas MEA carbon capture system, so that a closed loop of the single-effect lithium bromide absorption refrigeration cycle and the flue gas MEA carbon capture loop is formed, and the system efficiency and the resource utilization rate are improved.

In some embodiments, in order to more accurately determine the temperature of the condensed water output from the heat exchange station 70, a third temperature sensor (not shown) may be disposed between the heat exchange station 70 and the second cooling tower 355 and on the pipeline before the valve 356, so as to accurately control the opening and closing of the valve 356.

As shown in fig. 4, another aspect of the present invention also provides a method of providing a heat source, the method including steps S410 to S420.

And S410, producing pressure-bearing hot water by using the pressure-bearing hot water circulation loop.

And S420, providing a heat source for the organic Rankine cycle loop and the single-effect lithium bromide absorption refrigeration cycle loop by taking the pressure-bearing hot water as a medium, and driving the organic Rankine cycle loop to generate power and the single-effect lithium bromide absorption refrigeration cycle loop to refrigerate.

The method for providing the heat source in the embodiment of the utility model provides the heat source for the organic Rankine cycle loop and the single-effect lithium bromide absorption refrigeration cycle loop by taking the pressure-bearing hot water as a medium, thereby not only realizing flexible output of electricity, heat and cold, but also expanding the selection range of the organic working medium, being beneficial to realizing efficient matching heat exchange between the heat source and the organic working medium, and further improving the power generation efficiency and the heat efficiency of the system.

In summary, the utility model provides a biomass organic Rankine cycle combined cooling heating and power system and a method for providing a heat source, wherein a pressure-bearing hot water circulation loop is sequentially connected in series with an organic Rankine circulation loop and a single-effect lithium bromide absorption refrigeration circulation loop, and the pressure-bearing hot water is used as a medium to provide the heat source for the organic Rankine circulation loop and the single-effect lithium bromide absorption refrigeration circulation loop, so that the flexible output of electricity, heat and cold can be realized, the selection range of an organic working medium is expanded, the efficient matching heat exchange between the heat source and the organic working medium is facilitated, and the power generation efficiency and the heat efficiency of the system are improved. In addition, the utility model couples the MEA carbon capture loop of the chemical absorption method, captures the carbon dioxide in the biomass flue gas, realizes the carbon negative emission of a biomass energy system, provides heat for the flue gas MEA carbon capture system by recovering the exchange heat and the flue gas waste heat in the single-effect lithium bromide absorption refrigeration cycle, realizes the cascade utilization of the recovered cooling heat and the flue gas preheating, reduces the irreversible heat loss in the system, and obviously improves the heat efficiency of the system. In addition, heat in the exhaust steam generated by the flue gas MEA carbon capture system is further converted by the heat exchange station, so that the single-effect lithium bromide absorption refrigeration cycle and the heat closed loop of the flue gas MEA carbon capture loop are realized.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (15)

1. A biomass organic Rankine cycle combined cooling heating and power system is characterized by comprising:

the system comprises a pressure-bearing hot water circulation loop, an organic Rankine cycle loop and a single-effect lithium bromide absorption refrigeration circulation loop, wherein the organic Rankine cycle loop and the single-effect lithium bromide absorption refrigeration circulation loop are sequentially connected in series in the pressure-bearing hot water circulation loop through pipelines;

the pressure-bearing hot water circulation loop is used for providing a heat source for the organic Rankine cycle loop and the single-effect lithium bromide absorption refrigeration cycle loop by taking pressure-bearing hot water as a medium.

2. The biomass organic rankine cycle combined cold and heat and power system according to claim 1, wherein the pressurized hot water circulation loop comprises:

the biomass boiler comprises a biomass boiler (10), a pressure-bearing hot water outlet pipe (11) and a pressure-bearing hot water inlet pipe (12) which are connected with the biomass boiler (10), wherein a first evaporator (20), a generator (30) and a pressure-bearing hot water pump (13) are sequentially connected in series between the pressure-bearing hot water outlet pipe (11) and the pressure-bearing hot water inlet pipe (12) through pipelines;

the organic Rankine cycle loop and the single-effect lithium bromide absorption refrigeration cycle loop are connected in series in the pressure-bearing hot water circulation loop through the first evaporator (20) and the generator (30), respectively;

the biomass boiler (10) is used for combusting biomass fuel and air to heat feed water returning to the biomass boiler (10) through the generator (30) to obtain pressure-bearing hot water, the pressure-bearing hot water exchanges heat with an organic working medium in the organic Rankine cycle loop in the first evaporator (20) to provide a heat source for the organic Rankine cycle loop, and the pressure-bearing hot water after heat exchange provides a heat source for the single-effect lithium bromide absorption refrigeration cycle loop through the generator (30).

3. The biomass organic rankine cycle combined heat and power system according to claim 2, wherein the organic rankine cycle circuit comprises:

the first evaporator (20), an expander (21), a first condenser (22) and a working medium pump (23) which are sequentially connected in series with the first evaporator (20) through pipelines,

wherein, the organic working medium output of working medium pump (23) is connected the organic working medium input of first evaporimeter (20), be used for in first evaporimeter (20) with organic working medium carries out the input of the first heat exchange pipe of heat exchange and connects pressure-bearing hot water outlet pipe (11), the output of first heat exchange pipe is connected generator (30), in first condenser (22) be used for with organic working medium carries out the input of the first heat exchange water pipe of heat exchange and passes through the delivery pipe and connect the water supply end, the output of first heat exchange water pipe loop through first cooling water pump (222) and first cooling tower (223) with the input of first heat exchange water pipe is connected, power take off (24) is connected to the power take off end of expander (21).

4. The biomass organic Rankine cycle combined cooling heating and power system as claimed in claim 3, wherein a first three-way valve (221) is further arranged on a pipeline between the output end of the first heat exchange water pipe and the first cooling water pump (222), the input end of the first three-way valve (221) is connected with the output end of the first heat exchange water pipe, the first output end of the first three-way valve (221) is connected with the first cooling water pump (222), and the second output end of the first three-way valve (221) is connected with a first heating water supply pipe (411) through a domestic hot water pump (41);

when a first preset condition is satisfied, switching the first three-way valve (221) so that the second output end of the first three-way valve (221) is communicated with the first heating water supply pipe (411), and the first output end of the first three-way valve (221) is disconnected from the first cooling water pump (222);

when the first preset condition is not satisfied, the first output end of the first three-way valve (221) is communicated with the first cooling water pump (222) by switching the first three-way valve (221), and the second output end of the first three-way valve is disconnected from the first heating water supply pipe (411).

5. The biomass organic rankine cycle combined cold and heat and power system according to claim 4, wherein the single-effect lithium bromide absorption refrigeration cycle loop comprises:

the generator (30), a second condenser (37), a second evaporator (35), an absorber (33), a solution pump (32) and a lithium bromide solution heat exchanger (31) which are sequentially connected in series with the generator (30) through pipelines,

the input end of a second heat exchange tube used for exchanging heat with a lithium bromide solution in the generator (30) is connected with the output end of the first heat exchange tube, and the output end of the second heat exchange tube is connected with the pressure-bearing hot water pump (13);

the dilute solution input end of the generator (30) is connected with the dilute solution output end of the lithium bromide solution heat exchanger (31), the dilute solution input end of the lithium bromide solution heat exchanger (31) is connected with the dilute solution output end of the absorber (33) through the solution pump (32), the concentrated solution output end of the generator (30) is connected with the concentrated solution input end of the lithium bromide solution heat exchanger (31), the concentrated solution output end of the lithium bromide solution heat exchanger (31) is connected with the concentrated solution input end of the absorber (33) through a second throttle valve (34),

the output of generator (30) with the input of second condenser (37) is connected, the output of second condenser (37) pass through first throttle valve (36) with the input of second evaporimeter (35) is connected, the output of second evaporimeter (35) with the input of absorber (33) is connected.

6. The biomass organic Rankine cycle combined cooling heating and power system according to claim 5, wherein the single-effect lithium bromide absorption refrigeration cycle loop further comprises a chilled water circulation sub-loop,

the refrigerant water circulation sub-loop comprises the second evaporator (35), a refrigerant water pump (351), a second three-way valve (354), a cold supply water supply pipe (352) and a cold supply water return pipe (353),

a refrigerant water output end of the second evaporator (35) is connected with an input end of the second three-way valve (354) through the refrigerant water pump (351), a first output end of the second three-way valve (354) is connected with an input end of the first heat exchange water pipe, a second output end of the second three-way valve (354) is connected with the cold supply water supply pipe (352), and a water replenishing end of the second evaporator (35) is connected with the cold supply water return pipe (353) and is connected with the water supply end through a water supply pipe;

when a second preset condition is met, switching the second three-way valve (354) to enable a second output end of the second three-way valve (354) to be communicated with the cold supply water supply pipe (352), and disconnecting the first output end of the second three-way valve (354) from the input end of the first heat exchange water pipe;

when the second preset condition is not met, the first output end of the second three-way valve (354) is communicated with the input end of the first heat exchange water pipe by switching the second three-way valve (354), and the second output end of the second three-way valve (354) is disconnected from the cold supply water supply pipe (352).

7. The biomass organic rankine cycle combined cooling heating and power system according to claim 5, further comprising:

and the flue gas MEA carbon capture circulation loop is connected with the biomass boiler (10) and is used for processing the first flue gas generated after the biomass fuel and the air are combusted so as to capture the carbon dioxide in the first flue gas.

8. The biomass organic Rankine cycle combined cooling heating and power system according to claim 7,

the flue gas MEA carbon capture circulation loop comprises an air preheater (61), a flue gas purification device (62), an absorption tower (63), an MEA solution heat exchanger (64), an analysis tower (67), a cooler (69), a rich solution pump (65), a lean solution pump (66) and a reboiler (68),

wherein a flue gas inlet of the air preheater (61) is connected with a flue gas outlet of the biomass boiler (10), a hot air outlet of the air preheater (61) is connected with an air inlet of the biomass boiler (10), a flue gas outlet of the air preheater (61) is connected with a flue gas inlet of the flue gas purification device (62), a flue gas outlet of the flue gas purification device (62) is connected with an air inlet of the absorption tower (63), an air outlet of the absorption tower (63) is communicated with the atmosphere, a liquid inlet of the absorption tower (63) is connected with a liquid outlet of the desorption tower (67) through the MEA solution heat exchanger (64), the barren solution pump (66) and the reboiler (68) in sequence, a liquid outlet of the absorption tower (63) is connected with a liquid inlet of the desorption tower (67) through the pregnant solution pump (65) and the MEA solution heat exchanger (64) in sequence, the outlet of the desorption tower (67) is connected to a carbon dioxide storage tank (613) via the cooler (69).

9. The biomass organic Rankine cycle combined cooling heating and power system according to claim 8,

the single-effect lithium bromide absorption refrigeration cycle loop further comprises a cooling water circulation sub-loop, wherein the cooling water circulation sub-loop is connected with the reboiler (68) through a pipeline and used for recovering heat exchanged between the absorber (33) and the second condenser (37) and providing heat for the desorption tower (67) through the reboiler (68).

10. The biomass organic Rankine cycle combined cooling heating and power system according to claim 9,

the cooling water circulation sub-circuit comprises the absorber (33), a second cooling water pump (38), and the second condenser (37),

wherein, the input end of a third heat exchange water pipe used for exchanging heat with the lithium bromide solution in the absorber (33) is connected with the water supply end through a water supply pipe, the output end of the third heat exchange water pipe is connected with the input end of a second heat exchange water pipe in the second condenser (37) through the second cooling water pump (38), and the second heat exchange water pipe is used for exchanging heat with the refrigerant steam generated by the generator (30);

the flue gas MEA carbon capture circulation loop further comprises a steam generator (610) which is arranged between a flue gas inlet of the air preheater (61) and a flue gas outlet of the biomass boiler (10), and a water inlet and a water outlet of the steam generator (610) are respectively connected with an output end of the second heat exchange water pipe and the reboiler (68).

11. The biomass organic Rankine cycle combined cooling heating and power system according to claim 10,

the system further comprises a heat exchange station (70), wherein the heat exchange station (70) is respectively connected with the reboiler (68), a second heating water supply pipe (701) and a second heating water return pipe (702).

12. The biomass organic Rankine cycle combined cooling heating and power system according to claim 11,

the heat exchange station (70) is also connected with the input end of a third heat exchange water pipe in the absorber (33) through a second cooling tower (355).

13. The biomass organic Rankine cycle combined cooling heating and power system according to claim 12,

the system also comprises a third heating water supply pipe (412), wherein the input end of the third heating water supply pipe (412) is connected between the heat exchange station (70) and the second cooling tower (355) through a valve (356), and the output end of the third heating water supply pipe (412) is connected between the second output end of the first three-way valve (221) and the domestic hot water pump (41).

14. The biomass organic Rankine cycle combined cooling, heating and power system according to claim 4, wherein a first temperature sensor (224) is further arranged on a pipeline between the output end of the first heat exchange water pipe and the first three-way valve (221) and used for detecting the temperature of water output by the first heat exchange water pipe.

15. The biomass organic Rankine cycle combined cooling heating and power system according to claim 3, wherein the power consumption device (24) comprises an electric generator, a working fluid pump or a water pump.

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